There are two issues with this testcase:1) Your .tar.gz file is actually not gzipped, it's a wrongly named uncompressed tar file. See "file test.tar.gz" for proof.2) The code, on the other hand, forces the use of a KFilterDev for gunzipping as input device. This is unnecessary -- even if the input file was really gzipped -- because KTar is perfectly capable of handling real .tar.gz files as input.3) (Yeah I can't count). Deleting "file" and "root" is wrong, these are owned by KTar.